This photoelectric circuit was found in a 70’s Ferranti's documentation. The circuit uses an operational one from that time. Modern equivalent components can be used in a new project.
This high stability circuit is from the datasheet of the component used which is not very common...
This circuit uses only transistors, producing a pseudo-sequential effect with 6 LEDs. The circuit is...
This circuit was found in a 1987 magazine. It measures the pulse rate produced by a cardiac...